Thread-milling machine



c. H. scH'Unn ANDE. 1, LEES. `THREAD MILLING MACHINE.

, APPLICATfoN FILED I AY zo. |922.

l SHEETS-SHEET 2.

Y gc. H. SCHURRLAND .E.f1.-"L E.Es.

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{SKINS-SHEET a.

Reissue@ July 11,1922.

la I A n 1\- i g l l nl l l l I It L i M 99H. SCHUHE AND'EJ. LEES.

THREAD MILLING` MACHINE.

APPLICATION min Mv2o,1922.

n` o. I

Reisslled J uly 11, 1922.

UNITED STATES PATENT OFFICE.

CHARLES H. SCHURR AND ERNEST J. LEES, OF CLEVELAND, OHIO, ASSIGNORS TOTHE LEES-BRADNER C0., OF CLEVELAND, OHIO.

To all 'whomz't may concern Be it known that we, CHARLES H. SCHURR andERNEST J. Lnns, both citizens of the United States of America, residingat 6210 Carnegie Ave., city of Cleveland, in the county of Cuyahoga andState of Ohio, have invented a new and useful Improvement inThread-Milling Machines, of which the -following is a specification, theprinciple of the invention being herein explained and the lbest mode inwhich we have contemplated applying that principe, so as to distinguishit from other inventions.

Our invention is related to a thread milling machine and moreparticularly to a single improvement associated with the train of gearscommonly employed 4to predetermine the coordination or relative rates ofspeed between some particular spindle and the lead screw.

Heretofore, power thus transmitted at the head stock was taken from aprojecting end extremity or stud of a reduction spindle, which stud, ofcourse, made a iven number of revolutions and could ge satisfactorilyconnected by a train of gears to the lead screw for finer pitches. Inthe case, however, of long leads it was necessary, if the gearingwas tolikewise 4extend between such single reduction spindle and the leadscrew., to recoxnpute and re-arrange such gearing. Our inventioncomprehends the simple idea of having a second more rapidly rotatingspindle extremity serve as an additional stud from whence the gearreduction to the screw could be taken for longer leads.

We would have it expressly understood that we in no wise limit ourselvesto this specific application or embodiment of our invention, which wehave selected as a basis for illustrating and describing our inventionmerely for the purpose of rendering a clear and comprehensiveunderstanding of the scope and novel features thereof.

Averting to the drawings:

Figure I is a front elevation of a thread milling machine embodying ourinvention.

Fig. II is a head stock end elevation 0f the same.

Fig. III is an enlarged horizontal section of the head stock end of themachine to disclose the manner inwhich power is transmitted.

Specification of Reissued Letters Patent. Ieisisued July 11, 1922.

Original No. 1,355,854, dated October 19, 1,920, Serial No. 210,633,filed January 7, 1918.

reissue filed May 20, 1922.

Application for Serial No. 562,527.

F ig. IV is a correspondingly enlarged vertical section on line IV-IV ofFig. l.

Fig. V is a partial front elevation to similar scale showing certaininternal driving connections in dotted lines.

Fig. VI is a vertical section on line VI-VI of Flg. V.

Fig. VII is a vertical section on line VII-VII of Fig. V.

Fig. VIII is an end elevation of one detail of the mechanism.

Fig. IX is a section on line IXIX of Fig. VIII. Y

Power originates at the loose and fast pulleys l and 2 respectively seenin Fig. III, and from there may be cursorily traced in so far as itsroute of transmission is common in the machines upon which thisinvention is a slight though certain and important improvement. Theshaft 3 is rotated by the tight pulley 2 and such movement iscommunicated through gears 4 and to a spline shaft 6 leading in thecustomary manner to the cutter drive carried by a swivel head. Theshaft-3 transmits power to mechanism both for rotating thi` blank andfor eecting the lead of the tool. It carries loosely the bevel pinions Teach of which meshes with a bevel gear 8 upon a cross shaft 9 leading tothe front of the machine as appears in Fig. IV. A clutch 8aL is adaptedto transmit the drive to the shaft E) from either pinion and thereforein opposite directions. The latter continuously drives a bevel pinion 10which in turn` drives a bevel gear 11 on a` short shaft 12 .as be/clearly seen in Fig. V. Such shaft 12 drives a gear 13 which mesheswith a gear 14 loosely mounted on a shaft 15 whereby the latter, whenclutched thereto, may be driven at a given speed. Upon the end of theshaft 9 is another pinion 16 engaging with a wheel 17 on a shaft 18. Thelatter has mounted upon it a pinion 19 which meshes with a large gear 20secured to a t -cover appearing slowly drive it as required during thecutting operation,.respectively, as will later become evident.

That party of the machine which our Vpresent invention is moreparticularly associated is best disclosed in Figs, II, V and VII, theformer being an end view, the next an elevation of a portion of thefront with the parts inclosed thereby, a ar box in dotted lines an thelast being a vertica cross section looking toward the end illustrated inFig. II. The secondary driving shaft carries near its extremit a pinion26 which meshes with a ar near the inner end of a spindle 28.

twardly adjacent the gear 26 and likewise upon the spindle 15 is apinion 29 which meshes with a gear 30 on another lower and "narily moreslowly moving spindle 31.

Similarly mounted upon the spindle 31 inwerdly adjacent the gear 30 is apinion .32 which'engages a large gear 33 that is Aes Akeyed to the innerend of a lower and still lmore slowly moving spindle 34. The other 26.

end of the spindle 34 projects outwardly be- .yond and serves as adriving stud 35, being there provided with a spline 36 and securing,nuty 37. As so arranged the stud 35 constitutes'what will be referredto as the slow or ordinary source from which power may be'and heretoforealways has been communicated according to a predetermined harmoniousrelation through a train of gears. Such train is commonly known as theindexing train and may be varied at will according to the lead which itis re uired to impart for tle particular job. t should be understoodthat the indexing train has been omitted from Fig. V in order moreclearly to s how that the first gear forming a part thereof and which'isto be secured upon the stud 35 is to be removably secured thereto forthe double urpose of allowing the substitution there or of a gear havinga different number of teeth and besides so that the vindexing train may.have its power inr(ielption elsewhere as will now be-explained.

e feature of our invention consists in having the spindle 28 alsoproject outwardl beyond the machine to serveas another sp ined stud 38from, which power may he alternatively taken throu h the indexing trainconsristing of the bodily shiftable gears-39, 40, 41', 42 and 43, thelast mentioned of which is secured to the splined extremity 44 of thelead shaft 45. The stud 38 is necessarily rotating faster than the stud35 and in fact,

upon machines which we have built, so as toE rotate twelve times asfast. By lthus making two studs available where heretofore there hasbeen only one, from either of which power may be communicated throughthe indexin .train`, we have been enabled greatly to Simp ify thecomputation and rearrangement of the indexing train for different jobs,

Keyed to the shaft 15 is a pinion 46 which meshes'with a large ar 47similarly secured to the work s in le 48. It is manifest that therotation o such spindle in diiferent directions and at different' speedsis readily determined by the clutch control lever l25. The inion 46carries a sleeveextension 49 to w ich an indexing wheel-50 is attached,b means of its hub 51. To the hub 51 a plate 52 is screwed and thelatter is provided with holes 53 for receiving a pin 54 which is mountedin an arm 55'. This arm 55 is slidably splined on the secondary driveshaft 15 and therefore always rotates with this shaft. When thesecondary drive sh'aft is rotating and the pin 54 is in one of the holes53, the pinion.46 is caused to rotate which in turn rotates the work.When it is desired to index the work after the drivin shaft 15 Ahas stoped, the arm 55 is move to the right unti the pin 54 is disengaged. The

hand wheel 50 is then rotated whatever number of revolutions andfraction of a revolution may be necessary to properly index the work.

.It 1s a comparatively simple matter forthe operator to remember thenumber of complete cause not new and not claimed. One ring 56 isprovided with a pointer 57 and the other ring 58 has a pointer 59, andis rotatably mounted on the sleeve 49. 'The ring 58 is frictionally heldagainst rotation by means of an ordinary wire spring (not shown) and isto be rotateduntil the pointer 59 is in line with the pin, whereupon theother ring 56 is rotated until its pointer 57 indicates the fraction ofthe revolution through `which it becomes necessary to turn the indexingwheel. For instance if it is necessary to 'turn the hand wheell 5irevolutions the pointer 57 will be 90 from the pointer 59. The rings canbe locked together by means of a screw -so that the angular relationbetween the pointers of the rings will not be accidentally changed.

Ve claim:

1. A thread milling machine comprising a work spindle, a tool spindle,means for rotatin each, a movable'support for one of sai spindles, alead screw o eratively connected with said support and) adapted toactuate the same, intermediary spindles, a train of gearing upon saidspindles respectively in part adapted to connect said work rotatingmeans with said lead screw, a `plurality of said intermediary spindlesbeing rotatable at different speeds and having projecting ends lto serveas alternative driving studs,` one unit of mid train of gearing beingdetachably securable 'upon one of the projecting spindle ends wherebyone 130 spindles, chan said two spindles having portions or the other ofthe latter becomes an active unit of said connection.

2 A thread milling machine'comprising a work spindle, a tool spindle,means for rotating each, a movable support for one of said s mdles,a-lead screw operatively connecte with said support and adapted toactuate the same, gear train spindles, gearing connecting said geartrain spindles, a trainof indexing gears adapted to connect one of saidgear train spindles with said lead screw, a plurality of said gear trainspindles having outwardly projecting ends dlsposed in the same verticalplane whereby the initial power unit of saidindexing train may beshifted from one to 'the other and means for rotatably locking theselected initial power unit with the selected outwardly projecting end.

3. A thread milling machine comprising a work holder, a tool holder,means for rotating one of saidholders, a movable support for one ofsaid' holders, a device operatively connected with said support andadapted to actuate the same, auxiliary speed gearing upon said auxiliaryspin les whereby to rotate two of them at different speeds, said twospindles having end ortions in the same lane, and a tram of in exinggears each a justable to A all of its units within said plane andadapted collectively to connect either one of said auxiliary spindleends with said device wherebyto cause thelatter to f unctionate, saidauxiliaryspindle ends being splined, and a securing nut for holding oneunit of said change speed gearing in place upon one of said splinedends.

4. A thread milling machinevcomprising a work holder, a tool holder,means for rotating one of said holders, a movable support for one ofsaid holders, a device operatively connected with said support andadapted to actuate the same, spindles, change speed gearing upon saidspindles whereby to rotate twoat different speeds, in the same plane,and a train of indexing gears each adjustable as a unit within saidplane and adapted collectively to connect either of said spindleportions with said device whereby to causethe latter to functionate, andmeans for effecting operative connection between one of saidindexinggears and one of said pair of spindle portions.

5. A thread milling machine comprising a work holder, a tool holder,means for rotating one of said holders, a movable sup- 'and operativelyconnecte port for one of said holders, a devi-ce operatively connectedwith said supportand adapted to actuate change' speed gearing u on saidspindles with said rotating means whereby to rotate two at differentspeeds, said two spindles having projecting splined end portions, and atrain of indexing gears some of which are adjustable and adaptedcollectively to connect either one of said spindle ends with said devicewhereby to cause the latter to functionate, one unit of said train beingfurthermore detachably connected with one of said pair of splinedspindle ends, and means for se,- curing such detachable unit in place.

6. n a metal cutting machine, the combination with a blank-carryingspindle, a

cutting tool associated means for rotating said comprising a feed Shaftwith the spindle, s indle, and means or elfectig relativev feedingmovements between the blank.

and/the tool, of two auxiliary spindles respectively operated atdifferent speeds by said spindle rotating means, and means com-v prisinga train of gear wheels connected to said feed shaftand selectivelyconnected to one of said auxiliary spindles according to the feeddesired.

7. In a metal cutting machine, the com# bination with a blank-carryingspindle," a cutting tool associated with the spindle, a carriage forsupporting said tool, and means for rotating sald spindle, of a feedshaftfor movingsaid carriage, two auxiliary spindles respectivelyoperated at different speeds by said rotating means, and meanscomprising f a train of gear wheels connected to sald feed shaft andselectively connected to one of said auxiliary spindles vaccording tothe feed desired. .l

8. In a metal cutting machine, the combination with a blank-carryingspindle, a cutting tool associated with the I carriage forsupportingsaid tool, and means for rotating said spindle, of a feedshaft for moving said carriage, two `auxiliary spindles respectivelyoperated at different speeds by said spindle rotating means, and a trainof gear wheels connected to said feed shaft, one gear wheel of saidtrain being mounted on one or the other of said auxiliary spindlesaccording to the feed desired.

In testimony whereof, We have hereunto subscribed our names.

CHARLES H. sCHURR. ERNEST J. LEES.

the same, spindles,l

blank, a

